Fedora Linux Limitation

I am new to Linux OS. I have installed Fedora 10 on a server machine. This computer contains 4 opteron 875 cpu's and 32GB of memory.
I went to System Tools > Monitoring Software and it shows 0-5 cpu's and 3.5GB of memory, under the System tab. Why would it only show 6 cpu's instead of 8 cpu's. Also, the OS Is registering 3.5GB of memory instead of 32GB of memory. Does any one has any ideas?

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